Transmitting device for electric telegraphy.



No. 875,757. PATENTED DEC. 17, 1907. Y

' I. KITSBE.

TRANSMITTING DEVICE FOR ELEOTRIG TELEGRAPHY.

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UNITED sir-Arias PATENT. OFFICE;

ISIDOR KITSEE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO WILIEIAM .I. LATTA, OF PHILADELPHIA, PENNSYLVANIA.

TRANSMITTING DEVICE FOR ELECTRIC TELEGRAPHY.

1'0 all whom it may concern:

. Be it known that I, Iswon KITsEE, of the city and county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Transmitting Devices for Electric Telegraphy, of which the following is a s )ecilication.

My invention relates to an improvement in transmitting devices for electric telegraphy.

The usual code of telegraphy consists of dots and dashes and the key employed to transmit such dots and dashes consists of a movable leverand a stationary contact, the lever is generally connected to the line of transmission grounded at the distant end and the stationary contact is connected to a source of current grounded at the transmitting station. The depression of the lever sends an impulse over the line. If this depression lasts for one time-unit, the trans mitted impulse actnates the receiving instl'lement at the distant. station in a manner so that the receiving operator recognizes the same as a (lot, and it this depression of the lever, lasts for a longer time than one-unit, then the reeiving operator recognizes the same as a d sh. In this system the transmitted impulses are ol one olarit On submarine cables a double key is employed whereby with the aid ot one lover a positive impulse and wit h the second lever a negative. impulse is sent over the line.

'ln .lietters Patent No. 777,259, dated l)ecember lZ-lth, 1904, I have described a method whereby the speed of transmissionis claimed to be accelerated. This method consists in the transmission of what are system in which a positive impulse is always followed b a negative impulse, or vice versa,.and in whicl-i every impulse is of sub stantially the same intensity and duration and in whicli the dots and dashes are dillerentiated whereby a ,dot is characterized ,by one impthse', the. polarity of which does not come into consideration, and in which a l dash is characterized by two impulses in, quicksuccession, the second impulse always ol oppositepolar-H y to the tirst.

It is tl e'aim of my invention to enable the operatol' to transmit with the usual key and in the usual manner succeeding impulses ol' oppositepolarities and ot' substantially the same intensity and duration in accordance Specification of Letters Patent. Application filed March 16.1905. Serial No. 250.387.

' Patented Dec. 17, 1907.

with a code whereby a dot is transcribed by one impulse and a dash by two or-more impulses of opposite polarities, and in quick succession. w

F or this reason my invention consists substantially in the devices and arran ements as will hereinafter be more fully escribed, illustrated in the drawing, and more especially pointed out in the claims following the specification.

matic view embodying my invention; and Fig. 2 is a modifieatioliolpart of Fig. 1.

In Fig. 1, A is what I call an intermediate device as an entirety and B the transmitting key as an entirety. ()f this-transmittingkey B is the movable lever and B the stationary contact. The transmitting lever is here connected with the line 1 grounded at the distant point J. The device A embraces the eleotro-magnets M provided with the coils C and C and the coils I) and I), the polarized armature F, and the contacts G and G. The coils C and C are connected with one terminal through wire 2 with the point B of the key B and with the other terminal through wire 3 with the polarized armature l The contact (1 is connected through wire '5 witlrone pole of a source of current, here.

shown as the positive pole of the battery I and the contact G is connected through wire 4 with the opposite pole of a source of current, here shown as the negative pole of the battery I both grounded at J. The ar1natune I is provided with the means, hero shown as a weight F, tending to unbalance the center of gravity, thereby compelling the armature to fall against one or the other of the cont-acts G or G when brought into motion; therefore one or the other of the sources of current-I or I will always be connected through one or the other of the contacts with the armature and through the same and the coils C and C with the. contact B of the key B.

In the drawing, the armature I is illustrated engaging the contact ti. When et In the drawing, Figure l is a diagramtherefore the lever B is brought in tontact with the point B a circuit is established in which the current tlows from the positive pole of battery I, ground J, distant ground J, line 1, lever l3; contact it, wire 3, coils and C, wire 3, lever or arnuiture l". cont act (l, wire -l,liacl\ to the negative pole ol' the battery I. But the connections ot' the coils armature will be repelled from G} come to rest at (i.

As the lltllltslillSSlUll ofa dot according to and will i the Morse alphabet only requires the con- In other words, it the curthe core of C so that the end ,near the ai'ina- 1 turc will be ilow will energize the core of coil C in an alike manner and the core end of this coil near the armatu e will also be.S (south) and it the currenttlow is reversed, the coreends of both of these coils near the-armature will he N (north.)

The relation of the sources of current I and I as to the coils J and (l are such that the current-flow of I will tend to make the coreends near the armature 5" (south) andthc CtlIIOllt-ilt of I through these coils will make the core-ends near the armature N (north); It is now supposed as is illustrated in the draw ing, that the right-hand-side of the armature is S (south) and the leftha-nd-side of thearmature is N (north). When therefore, as is illustrated, the armature rests at the stop G connected to'the battery I, and the circuit is established including this battery, and the coils Cand C, it is obvious that, as the flow of these currents tending to make the core-ends near the armature S and as the right-hand side of the armature is S, the left-hand side being N the armature will be repelled from-the core oil) and will bc-attractcd by the core of C; the armature ill therefore break its conncction with G and will'make' contact with G; but as the battery I is connected with the positive pole "to contact G, the current will flow in the opposite direction from the former current-flow through the coils C and C, and both the core ends near the armature will then be N and as the leit-hand side of the armature is "N andthe righthand-side is S it is also obvious that the armature will be repulsed from G and attracted so as to make contact with (l, and UllS to and fro movement of the armature will continue as long as the circuit between B and B" is established; it bhing understood that the armature, as soon as repelled from one contact can only come to rest against the other contact and not midway between thcse two contacts. It is now supposed that the operator is transmitting a letter over the line consisti ing oi, say a dotanda dash, such as the letter A according to the Morse alphabet, and it issupposed that before the transmitting commences, the armature rests against the contact G. As soon as the lever B touches the contact B the circuit including the coils and the line is established, and the current will flow from I in the direction of the arrow,

' through said line and coil, but as the coreends near the armature will be made S (south) through the -flow of said current, the

(south) this same currenttact ol' the lever with the contact-point for one time-unit, and as it takes a time-unitfor the armature to move away from G and to conic in contact with G, the lever B will be released before the armature contacts with G and therefore the circuit will be open when such cont-act takes place, and the' lever-will conic to'rest at G. In transmitting the dash, the operator again depresses the lever B of the key B. A circuit is again established including the coil' and line but this time the current will flow in a direction opposite from the direction of thedoriner flow, and the armature F will be re ielled 'IIOIII G and contain contact with i and then be re )ellcd from G,and come in contact with and as in transmitting a symbol equal to a'dash, the-key is depressed for two units of time, the circuit between B and B will last-long enough toallow two inipulses to be transmitted over the line, one impulse from the battery I when the armature' rests against G and one impulse from the battery I when the armature rests against, G, and as then the lever is re leased, the armature when again attracted 96 by G will find the circuit open.

In considering the work'ng of this arrangement, the time la using betjveen the making ofthe contact of the armature F with one or the other of the contacts G or G, and the 100 repelling of the armature from such contacts, may be too short for the transmission of an impulse over the line so as to be etl'eetually felt atthe receiving instrument, and it is therefore necessary to provide means to ire long this contacting tor a further length of" time. And I have made use of an auxiliary device to etlect this purpose. In Fig. 1, this auxiliary device consists of sources of current and C-tllltltllSOl; and in the drawing one source of current is designated as 11, the second source of current as II and the condenser ash); and I have provided for thesesourccs of current and condenser thetwo coils I) and I). The source of cur rent Il is coi'inected with the positive pole to the contact (l and with the negative pole, through wire 7, with one terminal of coil l), theothcr terminal conncctcdwith the coil 1), the second terminal'of I) being connected through wire 6 with one part of condenser E, the other part of which is connected to the armature F. The source of current H is connected with the negative pole to contact; G and with the iositive pole through wire S 125 with wire 7. he coils D and D are arranged in a manner so that when the circuit including the source H is closed through the contacting oi thelever I? with G a moinentary curient is flowing through E in the 130 direction so as to counteract entirely the flow th'estraight flow of I and thereby holding for a fraction of time longer, the armature F against the stop G but as soon as the coin denser E is fully charged,- the flow will cease;

it is obvious that then the energizing effect of I will come in full play and the armature will be repelled. from G ,When'. then the armature comes to rest at G the condenserE will be charged oppositely, and this will tend to make the core-ends near the armature S (south) and therefore the How of" the current I will again be counteracted and the armature will rest fora fraction'oftime against the contact G; when the entire charge, of the condenser has taken place then this momentary current will cease and the armature will be repelled from the contact G. I

In Fig. 2 I have provided the contacts G and G with very light and easily compressible springs or other metallic pieces, which may follow the movement of the armature F for a certain distance away-from the contacts G and G, so as to prolong mechanically the contact with the source I or I and these pieces are designated in the'drawing as K and K Having now described my invention, What I claim as new and desire to secure by Letters Patent is:-

1. A transmitting device comprising the key proper, said key connected with one part to the km of transmission, a polarized relay, sources of current operatively connected with opposite poies to said relay, the coils of said relay connected with one terminal to part of the key proper and with the other terminal to the armature of said relay, and means whereby through the movement of the armature one or the other of the sources of current is alternately connected through the key proper to the line of transmission".

2.' In telegraphy, a transmitting station embracing a transmitting key connected with the interposition of a polarized electro magnetic device to the line of transmission,

, the polarizeddevice provided on each side of the armature with contacts connected each with a source of current, two coils for said polarized electro-rnagnet, the coils connected in a manner, so as to connect automatically for each depression of the key the line of transmission with a difierent source of current.

3. In telegraphy a transmitting station embracing a transmitting key connected with the interposition of a polarized electromagnetic device to the line of transmission, the polarized device provided on each side of the armature with contacts, provided also with means to connect a source of current with one polarity to the line when resting at one contact and to connect a second source of opposite polarity to the line when connecting with the second contact and electric means to alternately connect the armature with one or the other of said contacts through the depression of the key proper.

t. In telegraphy, a transmitting device embracing the key proper, a polarized relay operatively connected to the key and to two sources of current, the key operatively connected with the line of transmission, the coils of said relay arranged and connected so as to produce in the armature of said relay an automatic movement connecting alterna tiyely with one or the other of the sources of current, and electro-static means to prolong the contact-period of the armature with one or the other of said sources.

In testimony whereof, I hereby sign my 

